Process for producing optically active 4-halo-3-hydroxybutanoate
申请人:——
公开号:US20030134402A1
公开(公告)日:2003-07-17
There are provided a polynucleotide sequence coding for an amino acid sequence capable of preferentially producing (S)-4-bromo-3-hydroxy-butanoate by asymmetrically reducing 4-bromo-3-oxobutanoate, A DNA construct having a promoter in operative linkage with the polynucleotide sequence, a recombinant vector containing the polynucleotide sequences a transformant, a recombinant vector and the like.
There are disclosed a reductase having good heat stability, which resulted in decrease in reaction time and improvement of reaction efficiency. Specifically, disclosed is an enzyme having an amino acid sequence of SEQ ID NO:1 in which at least one of the amino acids of the positions 245 and 271 of the amino acid sequence of SEQ ID NO:1 is replaced with another amino acid(s); a polynucleotide having a nucleotide sequence that encodes the amino acid sequence of said reductase; a vector containing said polynucleotide; a transformant containing said polynucleotide or said vector, and the like.
本发明公开了一种具有良好热稳定性的还原酶,其导致反应时间减少和反应效率提高。具体而言,本发明公开了一种酶,其具有SEQ ID NO:1的氨基酸序列,其中SEQ ID NO:1的氨基酸序列的位置245和271中的至少一个氨基酸被替换为另一种氨基酸;编码所述还原酶的氨基酸序列的核苷酸序列的多聚核苷酸;包含所述多聚核苷酸的载体;包含所述多聚核苷酸或所述载体的转化体等。
Process for preparing L-carnitine and chemical intermediates employed
A process for preparing L-carnitine which comprises exposing .gamma.-substituted acetoacetic acid esters or amides to the fermentative enzymatic action of a microorganism which elaborates L-.beta.-hydroxyacyl CoA dehydrogenase [EC 1.1.1.35] , recovering the resulting, optically active corresponding .gamma.-substituted-.beta.-hydroxybutyric acid derivative and converting said derivative to L-carnitine. An improvement in the process is also disclosed which comprises reacting a 4-chloro-3(R)-hydroxybutyrate with sodium iodide or bromide to produce the corresponding 4-iodo- or 4-bromo-3(R)-hydroxybutyrate, converting the 4-iodo- or 4-bromo-3(R)-hydroxybutyrate to the trimethylamino-3(R)-hydroxybutyrate salt, then converting the trimethylamino-3(R)-hydroxybutyrate salt into L-carnitine. Novel chemical intermediates prepared in the processes are also disclosed.
Process for producing optically active-4-halo-3-hydroxybutanoate
申请人:Asako Hiroyuki
公开号:US20050019816A1
公开(公告)日:2005-01-27
There are provided a polynucleotide sequence coding for an amino acid sequence capable of preferentially producing (S)-4-bromo-3-hydroxybutanoate by asymmetrically reducing 4-bromo-3-oxobutanoate, A DNA construct having a promoter in operative linkage with the polynucleotide sequence, a recombinant vector containing the polynucleotide sequence, a transformant, a recombinant vector and the like.